One man saved the British Royal Family in the first decades of the 20th century - an almost unknown, and certainly unqualified, speech therapist called Lionel Logue, whom one newspaper in the 1930s famously dubbed "The Quack who saved a King". Logue wasn't a British aristocrat or even an Englishman - he was a commoner and an Australian to boot. Nevertheless it was the outgoing, amiable Logue who single-handedly turned the famously nervous, tongue-tied, Duke of York into the man who was capable of becoming King.